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It was the second time this week crews had been called to Norwich House in Bond St.
The building had been evacuated after Fire and Emergency New Zealand were alerted to a smell of gas at 4.12pm today, and part of the street was also cordoned off.
Occupants re-entered the building at 4.50pm.
A Fenz spokesman said firefighters wearing breathing apparatus and carrying gas detectors had checked the building, and reported that a smell was coming from a sewerage breather outlet on top of the building roof.
On Tuesday morning, Norwich House and neighbouring Consultancy House, also in Bond St, were evacuated after a smell of gas was reported.
Fire crews found no evidence of a dangerous gas leak at the time.